You are probably suffering from a fissure is ano. The extra skin you are referring to may be a skin tag which may be seen along with a fissure.
Next Steps
Sit in a basin of warm water twice a day for 19 mins. This will relieve the pain. take at least 10 glasses of water a day and increase your fiber intake ( fruits vegetables or over the counter fiber supplements like isabgol). it is important to drink lots of water when you take extra fibre.
Health Tips
Preferably use Indian toilet if available. if using European toilet, use a low stool to put up your legs and lean forward such that your trunk and thighs are at a 35 degree angle . Refer www.constipasana.com