Name one primary feature of scabies.

The primary feature of scabies is intense itching, especially at night. This itching is caused by an immune response to the mites and their secretions, which burrow into the skin. The itching often intensifies at night, making it a hallmark symptom that distinguishes scabies from other skin conditions. It may also disrupt sleep, leading to significant discomfort for affected individuals.

The other options described symptoms that are characteristic of different dermatological conditions. For example, development after sun exposure (the first option) is more typical of sunburn or certain skin cancers. Pus-filled blisters (the third option) are more indicative of bacterial infections or conditions like impetigo, while red, raised skin lesions (the fourth option) could suggest conditions such as eczema, urticaria, or psoriasis. In the case of scabies, the unique itchiness, particularly during the night, is key to diagnosis and management.