Thanks for posting your query.
A lump on the neck is painful is likely to be due to an infection- it can be a lymph
node swelling or an abscess
Skin abscesses are normally caused due to inflammatory reaction to an infection like bacteria or parasite. Abscesses may develop because of obstructed sebaceous or sweat glands, inflammation of hair follicles.
You can apply warm compresses to the area for about 30 minutes, four times daily.
You also need systemic antibiotics and drainage
of the abscess if there is pus inside. Please consult your physician for an appropriate treatment.
Wishing you good health.
Dr Saurabh Gupta.