What are the possible reasons for a big red bump on the scalp? (photo)

Thank you for the question. It is unusual to get a large pimple at this location. If it is red and painful, an insect bite is possible but an underlying infection or infected cyst is also possible. If the pain is still present, you should see your doctor or dermatologist to get this checked out. If there is an underlying infection , this should be treated early to prevent it from spreading.

To answer your question: essential oils do have mild hair growth stimulating effects, but they are very concentrated and thick, and may cause scalp oiliness and other side effects in the process. Once you stop the oils, the effects are also gone too. Minoxidil does not always have initial hair fall. It is an FDA approved medication for hair growth, and has foam versions to prevent scalp oiliness. Minoxidil is still way superior than essential oils. If you are having female pattern hair loss, I highly suggest for you to go for the tried and tested option.