I had a yeast skin infection that discolored the skin and now 3 weeks later my inner thighs has been slowly lightening and then crusting over. today it turned pink in spots after the crusting. is this the healing or possibly a reinfection?

By your description, it could be part of the healing process or it could be a re-infection. The only way to know for sure would be to see your doctor or perhaps a dermatologist so that it can be examined and then a diagnosis can be made and a treatment, if needed, prescribed. So, see your doctor first and then a dermatology referral can be made, if needed. Good luck!