Which marks appear as raised red skin lesions that typically appear within the first 6 months of life?

Infantile haemangiomas are benign vascular tumors that typically present as raised red skin lesions. They are most commonly seen within the first six months of life and can vary in size and appearance, often resembling a red mark or bump on the skin. These lesions arise from abnormal proliferation of blood vessels and commonly appear on the face, scalp, or trunk, though they can occur anywhere on the body.

This type of lesion may grow rapidly initially and then often undergo a process of involution, where they gradually shrink and may fade over time. This characteristic makes them particularly notable in infants, as they usually appear within the first few weeks to months after birth.

Mongolian spots, on the other hand, are bluish-gray marks often seen on the lower back and buttocks of babies, primarily those with darker skin tones. Salmon patches, also known as stork bites or angel's kiss, are flat, pink marks typically found on the nape of the neck or between the eyes and usually fade over time. Dermatologic conditions is a broader term that encompasses a variety of skin issues, making it less specific than the correct answer in this context.