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For whiteheads, you can use retinoid cream or gel. And for large pores, exfoliating scrub or a clay mask can be helpful as they help reduce the size of pores. Moisturizers and sunscreen( atleast 30 SPF) can also be useful to keep your skin healthy. 

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. 

Red rashes caused by sunlight can be treated. First of all, it is necessary to determine the origin and nature of rash. It is advisable to consult a dermatologist for correct diagnosis and treatment.