My thighs itch and red spots appear after scratching

Skin can be divided into delicate and rough types. Some people's skin is naturally delicate and cannot withstand the slightest stimulation. If it comes into contact with any allergens, it will itch, and red spots will appear after scratching. Generally, it does not itch or hurt.

So what causes this? When our skin comes into contact with the external environment, such as some metals and pollen that are prone to allergies, if you have an allergic constitution, you are likely to get urticaria.

The wheals and red spots of urticaria vary in size and shape, and the onset time is irregular. The wheals gradually spread and merge into sheets. Due to edema of the dermal papillae, the openings of the epidermal hair follicles can be seen sunken downward. The wheals and red spots last from minutes to hours, and in some cases can last for several days before disappearing without leaving any traces. The rash occurs repeatedly in batches, mostly in the evening. Wheals are often generalized but may also be localized. Sometimes it is accompanied by angioedema, and occasionally bullae form on the surface of the wheal.

Some patients may experience nausea, vomiting, headache, head swelling, abdominal pain, and diarrhea. Severe patients may also have systemic symptoms such as chest tightness, discomfort, pale complexion, accelerated heart rate, weak pulse, low blood pressure, and shortness of breath.

A disease that is cured in a short period of time is called acute urticaria. If the urticaria recurs at least twice a week for more than 6 weeks, it is called chronic urticaria. In addition to the common urticaria mentioned above, there are also the following special types of urticaria.

1. Skin scratch urticaria/artificial urticaria

2. Delayed dermatographism

3. Delayed pressure urticaria

4. Cholestatic urticaria

5. Cold urticaria

6. Solar urticaria

7. Contact urticaria

In addition, there are rarer types of urticaria such as heat urticaria, exercise urticaria, tremor urticaria, aquagenic urticaria, adrenergic urticaria, and electrical urticaria.

In general, urticaria can heal itself through the regulation of our body's immune function, so we generally don't need to be too nervous. However, if the small red spots and wheals on the body do not heal on their own for a long time or recur in a short period of time, you need to pay attention. It is best to go to the hospital for a comprehensive examination to find out the cause.