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Head on the lump can be:
1)Boil or abscess: It generally starts as a reddened, tender area. Over time, the area becomes firm and hard. Eventually, the center of the abscess softens and becomes filled with pus.
For such a bump, apply warm compresses and keep the area clean with topical antiseptics. Drainage is done only when it becomes soft and forms a head. Till then you can apply a topical antibiotic cream like Neosporin or Bactroban after consulting your doctor. You can also take some over the counter pain reliever like Ibuprofen and oral antibiotics after a doctor’s prescription.
2)The second possibility is of an infected and inflamed cyst like a pilar cyst. It is a benign cyst on the head and neck which is mostly painless but can become painful when infected. Treatment includes topical and oral antibiotics and surgical incision and drainage.
If the symptoms persist consider visiting a Physician for evaluation.
Take care