What are the little bumps on the top of my arms?

Keratosis pilaris: Runs in families. Harmless but for your opinion of them. Gentle cleansing abrasives and some moisturizer might help. A dermatologist may have ideas - but it's not a threat and often does vanish over the years. It is most common in young women. Try not to fret - that's less attractive than the bumps. Best!

Hyperkeratosis?: Always hard to tell without a picture, but commonly hyperkeratosis pilaris. This condition commonly affects the upper arms and is caused by a plugging of the hair follicles with Keratin. Treatment is to use non-soap cleansers and moisturise with urea cream. See http://www.dermnetnz.org/topics/keratosis-pilaris ... for more information

Bumps on arms: It will be difficult say without seeing the lesions. will be helpful if we can have picture and a bit more information please. it is possible that you may have KP. Keratosis pilaris (KP) is a very common skin condition characterised by the presence of follicular keratotic papules, sometimes associated with baseline erythema on the affected areas. http://patient.info/doctor/keratosis-pilaris-pro