Skin discoloration between the cleavage

I found out the cause of the skin discoloration between my cleavage.

It turned out to be heat rash.

I sweat a lot and wore tight underwear, so I think my skin got chafed and is gradually turning dark.

Someone told me it might be heat rash, so I switched to breathable underwear and blasted the air conditioner, and my skin is returning to its original color. I was really worried, but I'm so relieved that it took care of my body, and I wanted to leave a comment to thank you!

Thank you to the person who let me know!