I have an abcess above my knee its so painful i can't hardly walk and the pain has spread up my leg toward my groin does this sound like cellulitis?

Spreading infection: Cellulitis is when the infection is spreading through the soft tissues under the skin. Infection can also travel by lymphatic vessels. In that case, one would see streaks of red going up from the infected area to the lymph nodes. Both are dangerous situations and require treatment immediately. Please see your doctor asap. If not available, go to the emergency room immediately.

Yes: May be a complication known as lymphangitis where infection spreads in the lymph vessels. Would not hesitate to have this seen right away- need appropriate antibiotics +\- surgical incision an drainage.

I agree: You need to see a doctor to sse if you have a more serious cellulitis called necrotizing fascitis. You may need surgery for the cellulitis abscess plus to rule out necrotizing fascitis. See a docto now for you will need probably IV anibiotics and surgery to drain the abscess.