Describe the appearance of "strawberry hemangiomas".

Strawberry hemangiomas are characterized by their distinctive appearance as raised, red birthmarks. These lesions typically develop shortly after birth and are composed of a cluster of blood vessels, which gives them their bright red coloration. Over time, strawberry hemangiomas are known for their unique growth pattern; they often enlarge during the first few months of life and then gradually fade away, usually resolving completely by the age of 5 to 10 years. This process of growth followed by involution is a hallmark of strawberry hemangiomas, making them easily identifiable as a common childhood skin condition.

The other options do not accurately describe the nature of strawberry hemangiomas. Pale and flat marks on the skin do not align with the vibrant red and raised characteristics. Blue marks appearing around the eyes could refer to different conditions, such as bruises or other types of vascular malformations, which do not match the features of strawberry hemangiomas. Swollen areas filled with liquid suggest cystic lesions rather than the vascular proliferation seen in strawberry hemangiomas.