You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Clutch claw and ball appearance is seen in - and explain in detail?
The histology of lichen nitidus is very typical and described as the 'claw and ball' appearance: Focal dense lymphohistiocytic infiltrate in the upper dermis very close to the epidermis. Langhans giant cells are often present in the infiltrate. Rete ridges of the epidermis are elongated and 'clutch' the infiltrate. Red blood cells are seen just under the epidermis in the haemorrhagic/purpuric form. Eosinophilic dermal material with some cell nuclei may be seen within the epidermis in the perforating variant. Ref - pubmed.com