A gray pallor (‘lead hue’) can be due to heart or lung related causes such as angina, heart attack, rhythm problems, tuberculosis, emphysema, asthma etc. Chronic smoking, medications, and
metal poisoning can also cause gray pallor. These conditions can also cause bluish discoloration of gums. Hence you need a complete cardiac (heart) and pulmonary (lung) assessment.
Other than this you appear to be having some vascular problems, such as vasculitis, that could be compromising the blood flow.