So, you can treat your dry lips with sugar lip scrub as it is a big depository of skin -beautifying qualities if used topically on the skin as an exfoliating scrub. It has moisturizing properties that prevent the skin from drying and also unclogs the clogged pores and removes dead dry skin.
Lack means that something is missed or wanted, and thereof is an adverb which makes reference to something previously mentioned; it means of that or it.
What is a 'Shortage'. A shortage is a situation in which demand for a good or service exceeds the available supply. Possible causes of a shortage include miscalculation of demand by a company producing a good or service, resulting in the inability to keep up with demand, or government policies such as price fixing or rationing.