Underarm heat rash is difficult to care for.

Every year, like some kind of annual event, for the four months of June, July, August, and September

I have heat rash under my armpits, so I'm making a mess scratching it in the middle of the night.

Lately, due to heat rash, my quality of sleep has decreased and my quality of life

It's falling... It's not coming out well in other places, though.

It always appears only on my right armpit. Should I buy some heat rash or eczema ointment and apply it...?