Can you provide me with a picture ?
Have you seen a doctor yet ?
What is the duration of the symptoms ?
Do these itch ?
From your history i am suspicious that the cause of these bumps is ? allergic since your symptom worsen in sun and summers and associated itching . Most likely Provisional diagnosis is Eczema .
Ideally you need to avoid solar exposure , use anti itch lotion like calamine lotion .Emmoliants containing squalane can be applied all over the dry skin several times a day .
Antihistaminics can be taken for the symptomatic releif from the itching .
Locan steroid and gentamycin containing ointment may be prescribed by your doctor .
Also such consult a dermatologist for a clinical examination .
Hope this helps