I am 22 year old male. I was a regular gym guy. But with lockdown I had to live at home. So with time suddenly a pinkish stretch mark appeared in the armpit on both sides. With the passage of time it increasing at that area. I was using tretinoin cream from 1 week after spot discovered. Now 1.5 months passed still the marks are pinkish colour and increasing. Please suggest any treatment to stop increasing and for recovery.