As shown in FIG. 2, a dermal applicator device (20) comprising includes a housing (22) having a retainer (45) configured to hold and engage positively a spherical surface. A reservoir contains a liquid (28), with the reservoir contained within a shell (26) that is at least partially spherical but at least has curved surfaces supporting rotation. The shell is configured to be engaged within the retainer (45) to permit relative rotation of the shell (26) with respect to the housing (22). The liquid may be a salt solution, a gel composition or a polyol. The liquid is selected to have at least one of a freezing point below 0° C. and a specific latent heat of fusion higher than that of water. Preferably, the shell further includes an outwardly protruding lug (32) extending from its surface, and the housing is configured to form an orbital chamber (52) between an inner surface thereof and the shell (26) when the shell is retained in the retainer (45). The protruding lug (32) is constrained within the orbital chamber (52) such that rotation of the shell relative to the housing is restricted. By reducing the temperature of the retained salt solution or gel to below freezing, rotation of the shell locally massages skin brought into contact with the shell causing vasoconstriction and/or vasodilation which encourages vascular micro-circulation in the skin tissue.
