Coffee-colored spots on the legs of 2-year-old babies may be due to pigmented nevus, florid chaff rash, coffee spots, etc. Temporary observation, medication, laser treatment, etc. are available. 1. Pigmented nevus: pigmented nevus belongs to benign proliferation of melanocytes, which is considered to be related to congenital heredity or developmental defects, and most of the patients do not need treatment. 2. maculopapular furuncle: this is a fungal skin infection caused by Malassezia violating the cuticle of the skin, and it occurs in the parts with strong sebaceous gland secretion, after diagnosis, we can cooperate with doctors to carry out antifungal treatment, and commonly used topical medicines include clotrimazole, econazole, ketoconazole, and so on. 3. Coffee spot: may be related to heredity, can be found from birth to childhood, can be treated with laser. After the appearance of coffee-colored spots on the legs of 2-year-old babies, they should cooperate with doctors to clarify the specific causes and give targeted treatment and therapy.