Why does my left side under chin swell?

The likelihood of HIV infection is negligible if a diabetic needle pricks your hand. HIV is transferred via blood, however, the needle prick is not a high-risk exposure. If you are concerned, watch out for symptoms such as flu, fever, or rash. If you see them, go to a doctor. 

Acne scars and pigmentation can be treated with topical creams, chemical peels, and laser therapy, depending on the severity of the condition. You must consult a dermatologist for correct diagnosis and treatment plan.

Blisters on the foot can be caused by a number of factors including friction, burns or some skin conditions. The affected region must be kept clean and dry to prevent infection. I recommend to visit a dermatologist for a proper diagnosis and treatment.
 

Stress, neglecting oral hygiene, and certain foods can cause mouth ulcers. Usually, Omeprazole tablets are not used for the treatment of mouth ulcers as they mainly aid with stomach issues. For the treatment of ulcers, you can use over-the-counter remedies such as oral gels or rinses to reduce the pain and facilitate the healing process. Do not forget to maintain a proper dental hygiene routine and a balanced diet to keep them from returning. 

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.