Brief Answer:
the
boils are related to the rubbing and moisture
Detailed Answer:
HI
If the brown spots are like the other lesions you mentioned previously and they started as boils , then there are related to friction between the thighs and moisture.
Talc powder can cause problems in some persons. If you wish to use something else, you can consider plain cornstarch. This is mainly to prevent future occurrences by keeping the area dry.
For present treatment the previous advice would be helpful ( cleaning with mild antiseptic soaps, keeping the area separated and dry,
topical steroid cream), you can also add a
topical antibiotic cream to that, to speed up resolution.
If the brown lesions appear on their own, with no other preceding
rash, then it is possibly related to old age lesions (lentigo- in the case of age, usually solar lentigo).
The brown spots related to solar lentigo-are related to sun exposure, they appear on the legs, face, hands. They are not cancerous.
If this the case and they are bothersome then treatment is available such as freezing, oral medication,
chemical peels.
If the problem continues you may need to consult a dermatologist
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