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What causes itching at the injection site along with a hard lump after an injection?

Nov 05, 2024 Source: Cainiu Health
Dr. Yang Ziqi
Introduction
Local irritation after injection may induce or exacerbate neurodermatitis, possibly leading to itching at the injection site along with the formation of hard nodules. This is usually accompanied by symptoms such as skin thickening and scratch marks. It is recommended to treat under medical supervision using medications such as betamethasone tablets, triamcinolone acetonide tablets, or hydrocortisone tablets.

Generally, itching at the injection site accompanied by a hard lump may be caused by local tissue reaction, foreign body granuloma, bacterial infection, allergy, or neurodermatitis. If discomfort occurs, it is advisable to seek medical attention promptly. Specific causes are analyzed as follows:

1. Local Tissue Reaction

During injection, the needle punctures the skin and subcutaneous tissue, which may trigger a mild inflammatory response, leading to itching and a hard lump at the injection site. Mild local tissue reactions usually require no special treatment and resolve spontaneously.

2. Foreign Body Granuloma

If foreign material enters the subcutaneous tissue during injection, it may trigger a foreign body granuloma, resulting in itching and a hard lump at the injection site. If the foreign body is small and causes no obvious symptoms, intervention may not be necessary, as it could be naturally absorbed or expelled over time.

3. Bacterial Infection

If proper care of the injection site is not maintained after the injection, bacteria may invade and cause an infection. This infection can lead to itching and a hard lump at the injection site, often accompanied by redness, swelling, and pain. It is recommended to treat under a doctor's supervision with medications such as amoxicillin capsules, clarithromycin capsules, or metronidazole tablets.

4. Allergic Reaction

If an individual is allergic to components of the needle or the injected medication, an allergic reaction may occur, manifesting as itching and a hard lump at the injection site, possibly accompanied by redness, swelling, or warmth. It is recommended to take antiallergic medications such as levocetirizine hydrochloride tablets, mizolastine sustained-release tablets, or setastine hydrochloride tablets under a doctor’s guidance.

5. Neurodermatitis

Local irritation from the injection may trigger or exacerbate neurodermatitis, causing itching and a hard lump at the injection site. This condition is typically also associated with thickened skin and scratch marks. Treatment under medical supervision with medications such as betamethasone tablets, triamcinolone acetonide tablets, or hydrocortisone tablets may be recommended.

In daily life, maintaining good personal hygiene, including regular bathing and changing clothes, can help prevent such conditions.

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