Dry skin is the main cause for the formation of pimples or acne on the skin. Normally millions of people are prone to get acne during their life since it is one of the most common skin problems. Acne or pimples may develop anywhere on the body due to the underlying medical condition. For some people pimples develop on the skin since they take certain allergic foods. But many of them have pimples on their face. Pimples also occur on the arms and back giving embarrassing look for the person.
Causes :
Pimples occur on the arms because of dry skin layer. For some reason, the skin starts accumulating huge number of dead cells which in turn block up the pores, leading to reddish bumps or pimples on the hands. Very often people forget to bother about upper arms giving attention only to the lower arms and fingers. This may be the reason for pimple formation.
Pimple on arms can be hereditary in nature. For some people it is passed on to the next generation from the parents. Lack of vitamin D is another reason for developing red bumps on the skin. Change in hormone can very well trigger acne or pimple formation on the arms and this is more particular in girls who are in the stage of puberty. Even pregnant women can get pimples on the upper arms due to the same reason.
The major cause for pimple formation is the clogging of pores which accumulate dust particles forming pimples. The hair follicles on the skin get blocked due to excess of oil secretion. This in turn forces the skin to retain the dead cells which will lead to the development of pimples.