Here are some pubMed reports on the benefits of acidi pH water for the
skin:

Antimicrobial effects of acidic hot-spring water on Staphylococcus aureus
strains isolated from atopic dermatitis patients.
Akiyama H, Yamasaki O, Tada J, Kubota K, Arata J.
J Dermatol Sci. 2000 Nov;24(2):112-8

The present study examined the antimicrobial effects of acidic hot-spring
water on Staphylococcus aureus strains isolated from atopic dermatitis
(AD) patients.

link:
http://www.ncbi.nlm.nih.gov/sites/entrez?
Db=pubmed&Cmd=ShowDetailView&TermToSearch=11064246&ordinalpos=2&itool=Entr
ezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum

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Bactericidal activity of manganese and iodide ions against Staphylococcus
aureus:
a possible treatment for acute atopic dermatitis.
Inoue T, Inoue S, Kubota K.
Acta Derm Venereol. 1999 Sep;79(5):360-2

Acidic solutions containing manganese and iodide ions may thus be clinically
useful for
treating skin conditions caused by S. aureus.

link:
http://www.ncbi.nlm.nih.gov/sites/entrez?
Db=pubmed&Cmd=ShowDetailView&TermToSearch=10494711&ordinalpos=3&itool=Entr
ezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum

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Treatment of refractory cases of atopic dermatitis with acidic hot-spring
bathing.
Kubota K, Machida I, Tamura K, Take H, Kurabayashi H, Akiba T, Tamura J.
Acta Derm Venereol. 1997 Nov;77(6):452-4

Thus, the balneotherapy using acidic hot-spring water may be useful for
controlling
the skin symptoms of acute flares of refractory cases of atopic dermatitis.

link:
http://www.ncbi.nlm.nih.gov/sites/entrez?
Db=pubmed&Cmd=ShowDetailView&TermToSearch=9394980&ordinalpos=4&itool=Entre
zSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum