Vaseline is pure petrolatum, and pure petrolatum is a rich emollient and FDA-approved skin protectant. For some unknown and unsubstantiated reason, petrolatum has attained a negative image in regard to skin, despite solid research to the contrary. Topical application of petrolatum can help skin’s outer layer recover from damage, reduce inflammation, and generally heal skin. [1,2] It’s widely considered safe and highly effective. In fact, extensive clinical data has shown petrolatum to be a non-sensitizing ingredient. 
- Lodén M, Bárány E. Skin-identical lipids versus petrolatum in the treatment of tape-stripped and detergent-perturbed human skin. Acta Derm Venereol. 2000;80(6):412-5.
- Ghadially R, Halkier-Sorensen L, Elias P. Effects of petrolatum on stratum corneum structure and function. J Am Acad Dermatol. 1992;26(3 Pt 2):387-96.
- Schnuch A, Lessmann H, Geier J, Uter W. White petrolatum (Ph. Eur.) is virtually non-sensitizing. Analysis of IVDK data on 80 000 patients tested between 1992 and 2004 and short discussion of identification and designation of allergens. Contact Dermatitis. 2006;54(6):338-43.