You may have an infection in the stitches on your hand. When pus comes out, it indicates that there is probably bacteria which is causing the infection. This might have occurred if the wound was not kept clean. If there was a large red lump previously, it could have been an abscess. It’s crucial to have this seen by medical professional because, without proper care, things like these can worsen.

Acne is multi-factorial problem, hormonal disease in most of the patients, diet, exercise, hygiene, grooming practices play important role.so visiting dermatologist and taking treatment is one option and maintain treatment for long time because if you are getting any improvement with the treatment then continue it otherwise dermatologist will change it. there are few things that has to be taken care. One thing not to apply hair oil, avoid having dandruff or use anti-dandruff shampoos weekly on the scalp, using face washes that have salicylic acid or glycolic acid. Avoid using thick greasy moisturizers or cream on the face. Use only creams that are gel based or water based. Drink plenty of water, avoid fat or cheesy diet, exercise 10-15 mins of the day. Topical steroids have to be avoided. Topical antibiotics like Clindamycin are useful. Oral Antibiotics or retinoids are advised. 

Pigmentations are due to various reasons, Have to find out the underlying cause and treating the cause would be the primary approach Along , will start with depigmenting cream and sunscreens. Would suggest - Peels ,hydrafacial MD to see faster results. You can also visit the dermatologist near your place or have a video consultation with best dermatologist in Jodhpur Lake, Kolkata. Hope this answer helps you.

This hard mass might be a lipoma, which is usually harmless and consists of fat cells. These growths mainly develop under the skin and grow slowly over time. Although it is good that you have had a scan, sometimes further tests are necessary for conclusive results. However, if it is very painful or bothers you a lot, consider consulting with a surgeon who may recommend its removal.