Hello,
You are having skin discoloration on top of your buttock cleavage. You have started running (2)5k per week since about 4 months ago. Your symptom may be indicative of friction rubbing from clothing, infection of hair follicles, sweat and warmth causing
fungal infection, use of skin products that irritate the skin. Medical conditions that can cause such symptoms are Addison's disease, psoriasis, vitamin deficiencies, chloasma, post inflammatory
hyperpigmentation, etc.
You are suggested to avoid direct sunlight. Applying cool compresses will be helpful. Be gentle with yourself, do not scrub your skin. Use a soft towel to pat yourself dry. Apply ointment or cream containing aloe vera and a light water based moisturizer to relieve chafing. You can apply
silver sulfadiazine (1% cream) on the skin. For fungal infection applying
clotrimazole ointment on the affected area, it works.
After running you should wash the areas several times with fresh water. You can apply some calamine lotion at the rash as it will help in soothing the skin. Wear soft cotton undergarments and lose fitting soft cotton clothes. vitamin C and retinoids work well. If it remains persistent
consult a dermatologist. Your treating dermatologist may recommend
laser therapy, chemical peel, cryosurgery,
microdermabrasion.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Nupur K., General & Family Physician