Summary: This paper deals with a direct mathematical relationship of skin surface temperature and blood mass flow rate in dermis and subdermal regions of a human body. The investigations are based on the mathematical formulation for heat migration in skin and subcutaneous tissues of a human body. This formulation incorporates the effects of blood mass flow rate, rate of metabolic heat generation and evaporation from the surface at a moderate atmospheric temperature. The variational finite element method has been employed to solve the problem dividing the entire region in four natural compartments, namely, stratum corneum, stratum germinativum, dermis and subcutaneous tissues. Then blood mass flow rate in dermis and subcutaneous part is varied independently. The effect of this variation on the skin surface temperature is studied for suitable numerical values of various physical and physiological quantities thus involved.