Hidradenitis Heat, Sweat, and Friction: What to Log Beside Flares

Updated 29 Oct 2026

Dermatologists list several everyday things that can irritate skin with hidradenitis suppurativa: heat, sweat, rubbing clothes, shaving, and some skin products. Not every one matters to every person, and guessing which ones matter to you is hard.

This guide explains how to log these possible triggers beside your flares: how to record flares by area, and what to note about heat and sweating, clothing, shaving and hair removal, and skin products, then how to read the pattern with your dermatologist.

Why log heat, sweat, and friction with HS

The AAD notes that anything that injures or irritates your skin can worsen hidradenitis suppurativa (AAD). It names several sources of irritation: sweating and overheating, clothing that rubs, waxing, shaving nicks and cuts, scrubbing, and some antiperspirant and deodorant ingredients (AAD).

The AAD also notes that HS may affect your skin in different ways, and that working one-on-one with a board-certified dermatologist helps you find what works best for you (AAD). A log gives that conversation your own evidence rather than a general list.

Triggers are also easy to misjudge from memory. A flare after a hot week may be blamed on a new deodorant, or the reverse. Dates sort that out. A short note each day keeps both in view.

In Hidradenitis Journey, the Daily check-in keeps the same fields every day, so flare days and calm days compare fairly.

How to log flares by body area

Each evening, note any new lump, any lump that got bigger or more painful, and any that drained. Write the body area, such as underarm, groin, under the breast, or buttocks, and rate pain from 0 to 10. If you use dressings, note how many you changed that day, which shows drainage without a long description.

Use the same area names every time. The pattern you are looking for may live in one place: a flare under the waistband, or under a strap, points to a different cause than a flare everywhere at once.

For detail on area-specific weeks, see underarm flare weeks and groin flare weeks.

Note calm days too. A trigger only shows up against the days when nothing happened.

In Hidradenitis Journey, the Flare Tracker holds each flare with its area and date.

What to note about heat and sweating

The AAD notes that sweating and overheating can cause a flare-up, and recommends limiting activity in warm or hot places, staying in a cool space when possible, and being outdoors in the morning or late afternoon in warm weather (AAD).

Each day, note whether you were hot for a long stretch: a warm workplace, a heat wave, a long commute, a workout, a hot bath or sauna. Add a simple sweat score, none, some, or a lot.

If your job or home makes it hard to stay cool, write that down too. The AAD suggests asking your dermatologist for individualized advice if you live or work in an area that makes it difficult to avoid sweating or overheating (AAD). A few weeks of entries make that request specific.

In Hidradenitis Journey, the Daily Journal keeps a short note on heat and activity beside your flare entries.

What to note about clothing and friction

The AAD notes that when clothing rubs on skin with a painful lump or fluid-filled abscess, it can irritate the skin and cause HS to worsen, and suggests wearing looser clothing if HS flares when you wear tight or form-fitting clothes (AAD).

On days you wear something tight over an affected area, such as leggings, athletic wear, a uniform, a belt, or underwear with tight elastic, write it in a few words. Add how long you wore it.

If you need to wear tight athletic clothing, the AAD suggests asking your dermatologist how to reduce flare-ups (AAD). Bring the dates when that clothing came before a flare and when it did not.

Keep the wording plain, so a quick read of a month shows the repeats.

In Hidradenitis Journey, the Daily Journal holds these clothing notes next to the day's flares.

What to note about shaving, hair removal, and skin products

The AAD notes that dermatologists generally recommend never waxing skin with HS, and that if you shave, you take extra precautions to avoid nicks and cuts (AAD). It also advises stopping scrubbing, and choosing an antiperspirant or deodorant without alcohol, baking soda, parabens, dyes, or fragrance (AAD).

Log each shave or other hair removal on affected areas, with any nick or cut. Write the name of each wash, deodorant, or antiperspirant you use, and the date you start or stop one.

Change one product at a time. If two change in the same week, the log cannot tell which one mattered.

The AAD notes that laser hair removal can reduce flare-ups in studies, and that you and your dermatologist decide whether it is right for you (AAD). If you try it, log each session date.

In Hidradenitis Journey, My Meds can hold prescribed washes and treatments with their start dates.

How to review possible triggers with your dermatologist

After four to six weeks, look back. For each flare, read the two or three days before it: heat, clothing, shaving, products. Mark what repeats, and check whether the same things also happened on days with no flare. Treat what you find as a question to test, not a rule, and change one thing at a time to check it.

Prepare one page: the flares by area, the possible triggers that came before them, the products and clothing you changed, and what happened after. Put your main question at the top.

For a short appointment, see what to bring to a 15-minute visit. The AAD also advises telling your dermatologist if any wound fails to heal, opens up after healing, or becomes more painful (AAD).

In Hidradenitis Journey, the Doctor Report builds a dated summary for a saved doctor, and My Care Team keeps notes from each visit.

How Hidradenitis Journey can help

A notebook can hold a flare date. The harder part is keeping heat, clothing, shaving, products, and flares in one record, so a link is visible when you sit down with your dermatologist.

Hidradenitis Journey is a personal HS tracker from Health Journey Labs on the App Store and Google Play. It records flares, pain, sleep, medicines, and habits in one dated history, and its insights show which treatments and habits come before calmer or harder weeks. Learn explains the condition in plain words, and the AI companions, such as Clara, answer questions when a new symptom or result is hard to read. Below is what you can use and how each part helps:

• Daily check-in — A short guided pass across symptoms, mood, nutrition, sleep, exercise, meds, and external factors, including nodule pain, drainage, and skin-fold flares, so links you would not remember on your own show up side by side.
• Daily Journal — Freer notes, including voice when typing hurts, such as dressing counts, photo notes, and visit debriefs, that add detail a score alone cannot show.
• Flare Tracker — Mark a day clearly worse than your usual, with onset, sites, and intensity, so you can tell a one-off spike from a repeating pattern.
• My Meds — Medicine names and timing, so you can line up a start date or dose change with lump counts, pain, and sleep.
• My Labs — Result dates for swabs, blood work, imaging, and other tests, compared with how you felt in the weeks before and after.
• Weekly Goals — Set one small aim, such as a daily wash routine or looser clothing on long days, and see whether it held and whether flares changed.
• Learn — Short education topics on HS themes such as flares, sleep, pacing, and visit preparation.
• AI companions — Clara and specialist companions already see your logged history, which helps with visit wording or questions after a new diagnosis.
• My Care Team — A profile for each clinician, plus upcoming appointments and notes for each visit, used before, during, and after appointments.
• Doctor Report — Two views: the Appointment Planning Report helps you prepare what to ask, and Generate Report, opened from a saved doctor, builds a dated summary of your recent progress for that doctor.
• My Assessments — Structured check-ins that add context about you across weeks.
• Food Tracker — Meal and drink lines when food is something you and your clinician are watching alongside flares.
• Period Tracker — Cycle dates, so you can see whether new lumps cluster at a certain point in the cycle.
• Weight Tracker — Weight entries when weight is part of what you and your clinician are watching.

Everything you log builds one history. Guided forms include the key questions, and you can add custom symptoms when you need your own labels. Hidradenitis Journey is free to download.

Sources

• American Academy of Dermatology (AAD) — Hidradenitis suppurativa: Tips dermatologists give their patients

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