The appearance of discrete red bumps over the front of your elbow is a little peculiar. It does not suggest eczema or skin sensitivity which commonly affects this area but presents as red scaly patches instead.
The possible causes of your rash include insect bite reaction, inflammation of the hair follicles / ducts of skin glands as well as infiltrative skin disorders.
A close examination by your doctor who will examine if other parts of your body are similarly affected together with a thorough history may help shed further light on the cause of your condition.
Hope this helps!
Dr YC Choong