The ornamental design for a portablelotionapplicator, as shown and described.
FIG. 1 is a front plan view of a portable lotion applicator, showing my new design;
FIG. 2 is a back plan view of a portable lotion applicator, showing my new design;
FIG. 3 is a left plan view of a portable lotion applicator, showing my new design; and,
FIG. 4 is a right plan view of a portable lotion applicator, showing my new design.
The broken lines in FIGS. 1-4 are included for the purpose of illustrating a portion of the portable lotion applicator that forms no part of the claimed design.