Hello,
Welcome to health care magic.
It could very well be
internal hemorrhoids. You have not noticed external hemorrhoids protruding out of your anal orifice i guess.
Anal fissure also can cause this, but you should have pain over the anus and constipation.
It is better to
consult a General Surgeon than a
dermatologist for your concern. Fiber rich food, fruits, vegetables, Bananas and lot of water will help.
Hope this helped,
Take care