I ended up getting a thong burn. i applied some tee tree oil and feel better. i think i have a little tiny hole at the top of my butt crack or dent like one. it doesnt hurt, no bump. i tried to get a better view with my camera but cant see. ?

Burn: You are likely right of having a mechanical irritation and keeping the area dry and free of friction will be critical in allowing for time to heal. If symptoms persist or get worse, such as pain or discharge, seeing your doc for an exam will be needed as infections are possible in that area following skin breakdown.

Pilonidal sinus: You may be on your way to getting a pilonidal sinus/cyst. Visit this site for info: https://www.mayoclinic.org/diseases-conditions/pilonidal-cyst/symptoms-causes/syc-20376329 Have a healthy diet, exercise 30 minutes/day, drink plenty of water, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV vaccine. Wish you good health!