whereabouts in South Africa? The south is generally malaria-free (can't guarantee this, of course) but up by Kruger Park etc is much riskier. On the other hand, it's winter, as you say, and should be as safe as it gets. The spots may just be insect bites - I once found some after returning from a holiday, and suspect there were just bugs in the carpet on the plane. Maybe you could go and ask a chemist about his symptoms without initially involving your hsuband?