Need more details like if you have medical history like You may HAVE A THYROID or nutritional deficiency PROBLEM. Or may be a family history. Need more details such as age and lifestyle factors also impact these issues. Please visist an experienced dermatologist 

It seems your neck is a bit swollen but you are not feeling any pain. This could be caused by an infection or a swollen gland. Sometimes, it can occur without any serious reasons as well. However, the priority is to have a doctor take a look at it to be on the safe side. They may have to conduct some tests to be able to tell what is going on. 

Not taking proper food for so long can damage your body severely. The symptoms you talked about, for instance, your constant feeling cold and desire for hot water all the time, could indicate you are suffering from something serious such as malnutrition or damaged organs. You are supposed to go to specialists for diagnosed tests and treatments. You have to understand that it's not too late to get good treatment and work towards being healthy.

When certain allergies occur, body parts tend to swell. This might have been caused by contact with something like a plant or chemical that does not agree with you. Ensure the affected area is washed properly. To reduce the swelling, you can use an antihistamine. Seek immediate medical attention if things get worse or if you find it hard to breathe.

Your boyfriend may have a severe skin infection that’s spreading. The redness, swelling, and pain—coupled with swollen glands in the groin—indicate that it might be a bacterial infection. To cure this, he may require a course of antibiotics such as penicillin or cephalosporin which can help to fight off the infection. It is important to seek medical attention as soon as possible to avoid further complications.

Pimples, acne, and tan are usual skin problems. Red bumps are the assets of the pimple, while a bunch of pimples adds up to a pimple. They are the result of both oily skin and dirt on it. The face can be washed twice a day to achieve this. Implements such as benzoyl peroxide can be used to cure them. Tan is dark skin which is the result of the sun. Using sunscreen can prevent this. Getting rid of the tan takes time, use the skin-lightening creams or laser treatments instead.