Refer to Resistor Current Noise Measurement
Excess noise in a resistor is the electrical noise which is in excess of the value predicted by the well-known Johnsson-Nyquist-Thermal noise formula. Excess noise is created as a voltage impressed across a resistor causes electrons to flow through the resistive material.
In some types of resistors, the increase in noise is so significant that the circuit is useless.
Even in "very good" resistors the voltage noise density can increase by 50% over the Johnson-Nyquist-Thermal formula when 1V is impressed across the resistor. More over, the voltage noise density spectrum takes on flicker (1/f) shape as the DC voltage across the resistor is increased.
To the best of my knowledge, there is no SPICE variant with a .NOISE analysis which accounts for excess noise. Is this true?