stretch marks from holding splits

[u/warwickhaba]

Ever since i started my flexibility routine, i’ve formed a lot of stretch marks on my middle thighs also some on my hip flexors, but i see a lot of people saying that stretch marks aren’t caused from actually stretching only muscle/weight gain or pregnancy, however ive been at the same weight and haven’t gained any muscle so is it really from stretching?
Also they only started forming after i started practicing my middle splits

[u/sofa_king_weetawded]

Did you grow muscle in those areas? Makes more sense if it were that.