What is the ruling on prayer, purification, and dealing with recurrent obsessive thoughts regarding the impurity of pre-seminal fluid (madhy) and its spread, and the effect of old cupping marks and their lines on purity and the validity of ablution, especially after having stopped praying for two months due to these obsessive thoughts?

You have reached an extreme level of obsessive thoughts due to your indulgence in them. The cure for obsessive thoughts is to ignore them and not pay attention to them, because they are a trick from Satan to deter you from worship.

Know that things do not become impure merely by doubt, and the earth becomes pure by drying, and clothes do not become impure merely by sitting on an impure mat while they are wet. These are dispensations you can take advantage of.

Live your life normally, and everything around you is pure unless you are absolutely certain of its impurity. Your abandonment of prayer is proof that Satan has achieved what he wanted from you, so repent to Allah, maintain your prayers, and do not pay attention to obsessive thoughts. We advise you to consult a trusted doctor.