Hello,
There are many causes for lump between eye brows.
Few important and common causes are
1. Folliculitis
2. Infected sebaceous cyst
3. Acne
4. lipoma
Without clinically examining the lump and determining the exact size, shape, appearance and consistency of lump it may be difficult for me to determine the exact cause.
If you have headachess, vision difficulties and
weight loss then in that case forehead lump can signify serious problems like cancer or malignancy.
It is best to get the lump seen by a
dermatologist and clarify your doubts.
If he suspects, it to be due to infection, he may prescribe you some topical and
oral antibiotics.
If it is due to sebaceous cyst, he may excise the cyst.
Till then, take care of the pierced lump by maintaining the good personal hygiene.
wash the wound with warm water and clean with sterile cotton gauze pad.
Hope this helps.
Please write back for further queries.
wishing you good health.