Thanks for the query.
Probably you are suffering from a condition called as trichomycosis axillaris.
It is a bacterial infections and is seen along hair mainly in groin and axilla.
A photograph would have helped me in giving a closer diagnosis.
Treatment is with topical antibiotic
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.