What should you know about Sudocrem for dark underarms?

Underarm darkening can follow shaving, deodorant irritation, rubbing, or inflammation. Post-Inflammatory Hyperpigmentation may remain after the original irritation has settled, while moist redness, soreness, or odour in the fold can suggest Intertrigo. These causes need different approaches. A thick barrier cream may cushion chafed skin, but it does not diagnose or reverse every type of pigmentation.

Wash gently, dry the fold carefully, wear breathable clothing, and pause shaving or fragranced deodorant if either causes stinging. Test products on a small area and discontinue them if burning, swelling, or a new rash appears. Do not use abrasive scrubs or unlabelled bleaching mixtures. After an active rash is controlled, a clinician may discuss Hydroquinone Treatment, Chemical Peel, Laser Toning, or Laser Hair Removal, depending on the cause, skin type, and hair-removal history.

Arrange an assessment if the colour change is new and unexplained, spreads quickly, becomes thick or velvety, or appears in several skin folds. Prompt care is needed for pain, warmth, swelling, pus, significant odour, or rapidly spreading redness. Do not cover a wet or infected-looking rash with a cosmetic product and wait for it to settle.

Could this be irritation, Intertrigo, Post-Inflammatory Hyperpigmentation, or another condition? Which deodorant and hair-removal method are least irritating for me? Would a prescription treatment or procedure be appropriate after the skin is healthy?