Jock itch (tinea cruris) is a fungus, the same one that causes athlete's foot and scalp ringworm. The groin area is the perfect place for the fungi to grow and cause a fungal infection because it is moist, warm and dark.
The camshaft lift is the resultant net rise of the valve from its seat. The farther the valve rises from its seat the more airflow can be provided, which is generally more beneficial. Greater lift has some limitations.
Just how far (mathematically) each lobe raises the lifter is called the lobe lift. The lift that is typically referred to in a camshaft catalog is the valve, or gross lift, and is achieved by multiplying the lobe lift by the rocker arm ratio. For most small-blocks, the standard rocker ratio is 1.5:1, so, by multiplying a theoretical lobe lift of 0.370-inch x 1.5 rocker arm ratio, we achieve a valve lift of 0.555-inch lift (0.370 x 1.5 = 0.555). By replacing the standard rocker arm ratios with a higher-ratio rocker arm, you can add valve lift and some duration. If we use the camshaft with the 0.370-inch lobe lift and match it to a rocker arm ratio of 1.7:1, we realize a gross lift of 0.629 inches. Though these two gross lift examples are close to the upper end of a very high-performance small-block Chevy with a flat-tappet camshaft, the mathematical theory is the same for all engines.