Why sudden hair gap on my head?

Nightfall or wet dreams are common and normal phenomena for unmarried young people. It occurs precisely because your body is generating hormones. Having it happen twice a month can't be a cause for alarm most of the time. To minimize the frequency of such occurrences, avoid stimulating activities before bed, keep yourself busy during the day, and maintain a healthy lifestyle with regular exercise and a balanced diet.

The burning or pain you might be feeling is from the drugs you are using. To relieve the discomfort, you can use a mild soothing cream such as Vaseline or aloe vera gel which will help to ease the irritation and give some relief. Ensure that the region is kept dry and clean to quicken the healing process.

Acne is a result of clogged pores, bacteria, and surplus oil. However, wash your face two times a day with a mild cleanser. Do not squeeze the pimples because they will become much worse. Additionally, using medications containing salicylic acid or benzoyl peroxide will also do the trick. 

According to what you mentioned, you may have developed cheek pain without any redness or feeling cold. This can a condition known as trigeminal neuralgia which causes sudden and severe facial pains. Make sure you rest, use warm moist clothes on your face then take over-the-counter painkillers. However, if it does not improve or gets worse then you need to see a doctor for further advice.

Dealing with pimples and acne can be frustrating, but it's normal for your age. These skin issues happen when hair follicles get clogged with sebum and dead skin cells, leading to red bumps, whiteheads, or blackheads. Try using an over-the-counter acne cream with benzoyl peroxide or salicylic acid to help clear them up. Wash your face regularly and avoid scrubbing too hard. Also, avoid touching your face, as it can make things worse. Eating a nutritious diet and drinking plenty of water will help keep your skin healthy.