Insect bites on the palms of the hands may be caused by the secretion of toxins that lead to an allergic reaction, i.e., insect bite dermatitis, which manifests itself as hard lumps in the flesh.
Inflammatory cells such as lymphocytes and eosinophils infiltrate in the superficial and deep layers of the skin around blood vessels as well as between the layers of the skin after being bitten by an insect, leading to limited epidermal echinocyte edema accompanied by dermal papillae, and in some severe cases, intra-epidermal blisters or subepidermal blisters may be formed, which result in the formation of hard lumps that can be touched by the naked eye.
Therefore, it is necessary to do proper protection, such as minimizing the exposed parts when going out, or applying anti-insect cream to the body appropriately.
If the palms of the hands are bitten by insects, the hard nodule symptoms are clear and gradually aggravated, it is recommended to go to the hospital in a timely manner, by a professional doctor for treatment.