What should you know about Colgate for dark underarms?

Toothpaste is formulated for teeth, not the thin, folded skin of the armpit. Scrubbing it onto the area can cause burning, dryness or contact dermatitis. Inflammation may leave darker marks after the irritation settles, known as post-inflammatory hyperpigmentation. Darkening can also relate to friction, shaving, deodorant sensitivity or intertrigo, so appearance alone does not identify the cause.

Stop using toothpaste on the area and wash gently without scrubbing. Choose fragrance-free products, reduce friction, and pause shaving if it repeatedly causes bumps or burning. A dermatologist can examine the skin and create a plan; options may include carefully selected prescription products or an in-clinic treatment such as a chemical peel, laser toning or laser hair removal when appropriate. These treatments require skin-type assessment because irritation can worsen pigmentation.

Seek assessment if the colour change is sudden, involves thick or velvety skin, becomes itchy or painful, develops an odour or rash, or continues to spread. Get prompt care for marked swelling, blisters, drainage or severe burning after applying a product.

Ask what is causing the darkening, whether irritation or intertrigo is present, which products to stop, whether a pigment treatment is suitable for your skin tone, and how to reduce the chance of another dark mark.