The difference between allergy and itching is about one hundred bucks. People suffering from problem of itching have irritation on their skin and they feel like scratching it very hard to get relief from irritation. But it will only give you relief for some time and again you scratch your irritated area. This problem is very common in every person and it is not something very severe but if it is not treated on time, scratching can damage your skin and can leave bruises on your effected area. Itching is also the starting stage of allergy.