Thanks for writing to us.
From the description, it seems you could be having a boil. just do warm water compresses over the area and apply mupirocin
or fusidic acid
crea. Also do not try to squeeze or pop the lesions. Boils
are common in hairy areas which are prone to friction and sweat collection. So can occur over thighs, groins, underarms or hear umbilicus
If the lesions do not resolve in few days, please meet a doctor nearby.