Some common and less common symptoms of boils include: 1  Redness or itching on the skin. 2  Rapid growth of swollen area. 3  Painful, red lump. 4  Pea-sized to golf ball-sized swelling. 5  Yellow or whitish pus in the center of the swelling. 6  One or more points or heads on the swelling. 7  Oozing or crusting of the swelling.
About Limpets. The limpet is a mollusk and it is a member of Acmaeidae family. The limpets can be found throughout littoral zones and they are usually found on rocks near seas or oceans. The limpets have a flat shell and they stick on the rocks by using a muscular foot which allows them to remain attached on rocks if a big wave comes.
Besides the limpets as such (Patellidae), there are also keyhole limpets (Fissurellidae), which are much more highly developed. In contrary to them, real limpets never have a hole in the peak of their shells. But dead limpets' shells may be abraded by the sea, so holes can be found in limpet shells afterwards. Finally there are also the slipper limpets (Calyptraeidae). Apart from belonging to a completely different systematic group of gastropods, those sea snails only vaguely resemble a patellid limpet. Recommended Reading: Jessica M. Winder: Limpets (Patellidae), on Jessica's Nature Blog.