Why Does the Skin Sometimes Itch More When Scratched?

Generally, the phenomenon of itchy skin worsening with scratching may be caused by factors such as impaired skin barrier, sensitive nerve endings, contact dermatitis, eczema, psoriasis, and others. It is recommended to seek timely medical consultation to identify the underlying cause and receive appropriate treatment under a doctor's guidance. Detailed explanations are as follows:

1. Impaired Skin Barrier: Excessive cleansing and frequent friction can damage the skin barrier, reducing its ability to retain moisture and increasing sensitivity to external irritants. Scratching further aggravates the barrier damage, leading to increased itchiness. In daily life, reduce the use of harsh cleansing products, choose mild moisturizing lotions, and apply them promptly after bathing to maintain skin hydration.

2. Sensitive Nerve Endings: Scratching stimulates nerve endings beneath the skin, prompting the nerves to release more itch-related signals, creating a cycle of scratching and increased itchiness. Cold compresses may help relieve itching, and scratching with fingernails should be avoided. Instead, gently press with the fingertips to reduce stimulation of the nerve endings.

3. Contact Dermatitis: Inflammation is triggered when the skin comes into contact with allergens or irritants, causing itching. Scratching can worsen the inflammatory response. Patients may follow medical advice to use medications such as hydrocortisone butyrate cream, mometasone furoate gel, or halometasone cream, while avoiding further contact with the causative agent.

4. Eczema: Associated with genetic and immune abnormalities, eczema causes red patches, bumps, and severe itching. Scratching can easily lead to skin damage and infection. Patients may follow medical advice to use medications such as desonide cream, tacrolimus ointment, or pimecrolimus cream to alleviate symptoms. Wearing loose and breathable cotton clothing is recommended in daily life.

5. Psoriasis: Due to immune system dysfunction, skin cells proliferate excessively, resulting in red patches, scaling, and itching. Scratching may cause the lesions to spread. Patients may follow medical advice to use medications such as calcipotriol ointment, tazarotene gel, or tretinoin cream. In severe cases, narrowband UVB phototherapy may help reduce skin lesions.

In daily life, it is important to keep the skin clean and avoid frequent hot washes, using mild cleansing and skincare products. Wear soft, breathable clothing to minimize skin friction. Avoid spicy and irritating foods in the diet, and consume more fresh fruits and vegetables rich in vitamins to help maintain healthy skin.