IUD will only prevent pregnancy. There are progesterone impregnated IUD also which help you control your blood loss during periods. But you will have to see if they control your acne or oily skin. Anyone can use an IUD. But it is easier to insert IUD in a woman who has had a NORMAL delivery or an abortion once (earlier).

Hello pills are better then iucd in my opinion as iucd is intrauterine device ,can cause infection in uterus .

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IUD will not help in skin issues. There are hormone containing IUD as well but they act locally on uterus. IUD can be used in any person but preferably if women has given birth or had abortion. IUD may have some issue as well like irregular bleeding initially or infection. But it is a good long term contraception. U have to choose between them

No will not Yes

IUD has no effect on skin . Preferably  inserted in women who have delivered  in past .