Acocrding to ur history might be u r suffering with frictional dermatitis
. These type of dermatitis seen in atopic person or u have tinea
infection. Confirm diagnosis can be done after seeing the lesion.Bilateral lesion on both legs n butt favour toward the dermatitis. But if u took steroid
for long time tinea infection may be.U r not mentioning the duration of treatment. Sodon't start steroid self , first of all done skin scraping for koh mount confirm the diagnosis &thn o ahead under supervision of dermatologist
.Idon't think it is related to ur bld pressure.